Adsorption of heavy metal Cu2+by ZIF-8 doped graphene/chitosan microspheres
The issue of heavy metal pollution in water has garnered significant attention due to the non-biodegradable and bioen-riched nature.In this study,we prepared micro-scale sized Zinc-based metal-organic framework(ZIF-8)doped graphene/chi-tosan(GO/CS/ZIF-8)microspheres that can be easily recovered,with a focus on investigating their adsorption properties and mechanism towards Cu2+ions in aqueous solution.The results demonstrated that GO/CS/ZIF-8 microspheres exhibited an im-pressive adsorption capacity for Cu2+ions,reaching 101.8 mg/g primarily through single molecular layer chemisorption.Fur-thermore,the Freundlich model effectively simulated the isothermal adsorption process of Cu2+by GO/CS/ZIF-8 micro-spheres.The fitting analysis of adsorption kinetics demonstrated that the adsorption of Cu2+by GO/CS/ZIF-8 microspheres ad-hered to the pseudo-second-order kinetic model,indicating predominant chemisorption.Thermodynamic analysis revealed that this adsorption process was endothermic,with increased temperature favoring higher levels of adsorption.
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